package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.UserNotLoginException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    private static final String WX_LOGIN_REQUEST = "https://api.weixin.qq.com/sns/jscode2session";
    /**
     * 微信用户登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxlogin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获取用户的openid
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空，如果为空抛出业务异常
        if (openid == null || openid.isEmpty()){
            throw new UserNotLoginException(MessageConstant.LOGIN_FAILED);
        }
        //判断是新用户还是本来数据库里面就有,新用户则自动完成注册
        User user = userMapper.getByOpenid(openid);
        if (user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        //返回用户对象User
        return user;
    }

    private String getOpenid(String code){
        Map<String, String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String result = HttpClientUtil.doGet(WX_LOGIN_REQUEST, map);
        JSONObject jsonObject = JSONObject.parseObject(result);
        return jsonObject.getString("openid");
    }
}
